The Cobb Board of Commissioners is scheduled to vote Tuesday on the “Guaranteed Maximum Price” of SunTrust Park. Cobb Chairman Tim Lee says no matter what the cost, the the county’s contribution is capped at $300 million. Lee told the Marietta Daily Journal that as American Builders 2017 - the joint venture of four firms hired as the general manager of the project - and the Atlanta Braves finalize the design of the stadium, a guaranteed maximum price for the core cost of the stadium will be…